The Best Episodes Written By Steven Molaro

Nick is forced to confront the boys when he finds a pack of cigarettes in the house, and when the guilty party reluctantly owns up to them, he calls Nick on his hypocrisy, as Nick himself smokes cigars. In an effort to convince his son to quit, Nick makes a deal with him that he finds very hard to keep.

Kyle finds himself smitten with Josie, a girl he is used to spending time with in detention, but fears having a girlfriend will turn him into a "wuss." Meanwhile, T.J. and the boys are hard at work on a "destructo-boggan" which is guaranteed to knock all of the inner tubes off the slopes this year, and Sam is poodle-sitting his girlfriend Angela's dog, Sally Sue, which doesn't sit well with the Savage dog.

Chris is thrilled when he is asked to the "Backwards Dance," in which the girls ask the boys, by Jessica, the hottest girl in school. The only problem is that Jessica is the leader of the dance squad, and Chris – who is a terrible dancer – will have to dance with her in front of the entire school. Meanwhile, there's trouble in paradise when Angela and Sam disagree on plans for the dance; and, in their quest to film each other doing dumb things for an America's Funniest Home Videos-style website, Kyle and T.J. finally drive Nick to the breaking point.

The Cooper family grapples with the death of George Cooper Sr.

News of the tornado reaches Sheldon and Mary in Germany. Also, with the Cooper house in chaos, Missy steps up.

When Mr. Nichols's boss calls off their dinner plans because of a last minute babysitter cancellation, Josh volunteers his and Drake's services.

Sheldon helps his roommate try to beat the stock market, Missy and Billy Sparks throw a party, and Mary finds a new church.

George Sr. gets an exciting job offer, and Sheldon prepares for his move to California.

Leonard tells Penny about how he met Sheldon for the first time...and what happened to the elevator.

With Leonard, Howard and Raj away camping in the desert, an injured Penny has only Sheldon to rely on.

Sheldon leaves East Texas for the California Institute of Technology following the death of his father.

Georgie and Mandy get fed up living with her parents, the McCallisters.

After more than five years of dating, Sheldon and Amy spend their first night together. Also, Leonard, Wolowitz, and Koothrappali must decide who will take their extra Star Wars movie ticket.

Leonard and Penny are drawn together after a disastrous visit from Leonard's mother.

Sheldon protests when the gang drags him to Mrs. Wolowitz’s house for Thanksgiving. Meanwhile, Penny and Leonard must deal with a mistake from her past.

Sheldon's latest scientific breakthrough leaves him feeling like a fraud; a romantic gesture between Howard and Bernadette causes Penny to up her game with Leonard.

Chase writes a play, and he is cast as the lifeguard, and Zoey is cast as the alien, who he gets to kiss. Chase is excited, but then Logan auditions and gets the part instead. Chase becomes obsessed with what will happen between Logan and Zoey. Meanwhile, Dustin has a fever and Quinn tries to cure him by using one of her "Quinnventions".

Georgie struggles to balance life, work and family; Mandy worries for Georgie's wellbeing; and Missy gets into trouble at school.

Things get awkward when Georgie and Mandy try to make new friends. Meanwhile, Jim and Audrey get competitive playing a game with Connor. Mandy befriends Beth, a fellow waitress at the diner, who is looking for fun in the wake of her recent divorce.

As the guys don costumes and go on a road trip to a comic book convention, the ladies decide to stay home and try to interpret a comic book.

The fifth season ends with Howard and Bernadette deciding to get married before his NASA mission, causing the gang to scurry into overdrive in an effort to stage the wedding. NASA astronaut Mike Massimino has a cameo as himself.

When Amy's parents and Sheldon's family arrive, everybody is focused to make sure all wedding arrangements go according to plan – everyone except the bride and groom.

Sheldon's search for the answer to a physics problem leads him to work at the Cheesecake Factory with Penny.

Sheldon has a revelation when he realizes why a song was stuck in his head. Also, Amy invites Dave over for dinner despite their previously awkward date, and Wolowitz and Koothrappali become obsessed with a fan of their band, "Footprints on the Moon".

When the entire gang competes in a scavenger hunt designed by Raj, it brings out the best - and worst - in everyone.